Forging and annealing furnace.



1. A. MAHR.

foams AND ANNE/.UNG FURNACE.

PPLCATSON FILED MAY 25l916. l T l ,285,76 l Patented Mv. 26, 1918,

2 SHEETS-SHEET 2.

@Vil/asses 'a citize J'ULUS A. MAHR, F MINNEAPOLIS, MINNESOTA.

FOBGING AND ANNEALING FURNACE.

wearer.

Specification of Letters Patent.

Patenten Nov. 26,1918.

Application filed may 25, 19.16. Serial No. 99,764.

To all whom t mag/concern.'

Be it known that l, JULiUs A. MAHR, of the United States, residing at Minneapolis, in the county of Hennepin and State of Minnesota, have invented certain new and useful Improvements in Forging and Annealing Furnaces; and l do hereby declare the following to be a full, clear, and exact description ot' the invention, such as will enable others skilled in the art to which it a pertains to make and use the same.

y'invention relates to improvements in forging and annealing furnaces; and, to this end, it consists of the novel devices and combinations of devices hereinafter described and defined in the claims.

In' theV accompanying drawings, which illustrate the invention, like characters indicate like parts throughoutl the several views.

Referring to the rawings,

Figure 1 is a front elevation of a furnace having the invention incorporated therein, some arts being broken away and some parts eing shown in section;

Fig. 2 'is a vertical longitudinal central section;

Fig. 3 is a horizontal section taken on the irregular line aas w8 of Fig. 2;

Fig. 4: is a detail viewv in "section taken on the line mt m4 of Fig. 1f,

Fig. 5 is a detail view in section taken on the line m5 m5 of Fig. 1; `and Fig. 6 is a fragmentary detail view, with some parts sectioned on the line of Fig. 1.

ln the drawings, the invention is shown incorporated in a rivet forging furnace comprising a housing 1, supported on relatively long legs 2 and having at one end an out'- wardly and downwardly projectingA externV sion 3. .The'liousing 1 and its extension 3 are made up ot a sectional cast metal casing open at its top and a lining of fire brick or other refractory material, which aiiords the sole top for the housing.

Formed in the housing 1, is a heating chamber l having a door opening 5, termed in the front wall ot' said housing, and also having a deiiecting surface 6 extending Vfrom the top thereof, part way down onto one of its sides, to wit: the one opposi yethe extension An. oblique combustion chamber 7 extends' completely tlfircugh the .housing extension 3 and has communication, at its upper end, with the heating chamber 4 through a passageway 8, located at the top of said heating chamber. Also formed in the housing extension 3, is an auxiliary air intake passageway 9, the receiving end portion of which extends parallel to the combustion chamber 7A and the delivery end portionV of which extends horizontally slightly below. thetop of the heating chamber 4 and opens into the combustion chamber 7, at the passageway 8.

An air chest 10 is bolted or otherwise rigidly secured to the lower en d of the housing extension 3 and is provided with a lnozzle 11, which extends into the lower' end of the combustion chamber 7.. A.. port 12, in theair chest 10, connects-the cham'- ber thereof with the auxiliaryl intake passageway 9.

Air is delivered through a pipe 13, under pressure, -froin a into the air chesti10 blower, indicated as an entirety by the 'n umera-'l 14'. This pipe 13 extends in. fronti? oi the housing 1 and its extension 3 and 'has- A interposed therein an air preheater 15 and f an oil preheater 16. The air preheater 15 is in the form of a casting bolted to the front of the housing 1, above the bottom of the door opening 5 and is spaced slightly outward from the front faceA of said housing. This air preheate'r 15 has a relatively narrow vertically extended chamber ,into the lower` por tionv of which the delivery end of the pipe 13 opens and from. the upper portion of which leads the delivery end vportion of said pipe. ',ihe pipe 13, from the air preheater. 15 to the air chest 10, extends downward and has interposed therein the oil preheater 1 6. This oil preheater 16 forms a section of the pipe 13 and has formed in its under side a. segmental-oil chamber 17.

An oil pipe 18. leading from' a storage tank or other suitable source of supply, not shown, has its delivery end secured to the oil preheater 16 and arranged to discharge into the lower end portion-ot its chamber 17. rl'he oil from he pipe 18 passes upward through the inclined chamber 17 and into a pipe 19, having anozzle 20 secured to its delivery end. rthis nozzle 20 extends completely through the air chest 10, air nozzle into the combustion chamber, an-oil .nozzle extending into the air nozzle, and a valve mounted on the oil nozzle for controlling the air nozzle.A A

2. In a furnace of the kind described, the combination with a housing having an out- Wardly and downwardly projecting exten- `sion, said housing having a heating chainber and said. extension having a combustion chamber and an auxiliary air intake passageway., said combustion chamber and auxiliary air intake passageway having a conimon delivery int-othe heating chamber, of an air chest applied tothe lower end of said extension and having an air nozzle extending into the combustion chamber and a port leading to the auxiliary air intake passage-1 Way an oil nozzle extending through the air nozzle, and a valve for closingsaid port.

3. A metal heating furnace comprising a housing 4having a heating chamber, a conibustion chamber, an auxiliary air intake passageway, said combustion chamber and aux-v iliary air intake passageway having a com-f mon delivery into the heatlng chamber, an

air .chest having an airnozzle extending into the combustion chamber, a' communicating port between the air chest and auxiliary air intake passageway, an .oil nozzle'extending through the air nozzle, and a valve for closing said port. i

In'testiniony whereof I affix my signature in presence of two Witnesses.

JULIUS A., MAHR.

Witnesses:

F. D. MERCHANT, HARRY D. KILoRE. 

